Electricity and Magnetism

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It can be turned on and off by controlling the current.

Front

What is the formula to calculate current (I) in a circuit?

Back

I = V/R, where I is the current in Amps, V is the voltage in Volts, and R is the resistance in Ohms.

Front

What happens to the poles of a magnet when it is cut in half?

Back

Both halves of the magnet will have a North pole and a South pole.

Front

What is a permanent magnet?

Back

A permanent magnet is a material that maintains a persistent magnetic field without the need for an external power source.

Front

What is Ohm's Law?

Back

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor.

Front

What is the unit of electric current?

Back

The unit of electric current is the Ampere (A).

Front

What is the relationship between voltage, current, and resistance?

Back

Voltage (V) is equal to the current (I) multiplied by the resistance (R), expressed as V = I * R.

Front

What type of magnet is used in refrigerator magnets?

Back

Refrigerator magnets are made of permanent magnets.

Front

How do you calculate the voltage needed for a specific current and resistance?

Back

Use Ohm's Law: V = I * R.

Front

What is the unit of resistance?

Back

The unit of resistance is the Ohm (Ω).